three-phase relay testing| Detailed introduction of technical principles

The relay protection tester is a dedicated "test" for relay protection devices. Its core principle is to simulate various normal and fault states of the power system (such as short circuits, grounding, and oscillations) through high-precision digital simulation and power amplification, injecting corresponding voltage and current signals into the protection device while receiving its action feedback to comprehensively verify the correctness of its logic, settings, and operating time.

The workflow is as follows:

1. Analog Output: The built-in digital simulator can be flexibly programmed to generate and amplify the output of simulated transient or steady-state three-phase voltage and current signals of the power system. The amplitude, phase, frequency, and harmonics can be precisely controlled.

2. Signal Injection: These "fault signals" are synchronously and accurately applied to the voltage and current input terminals of the protection device, simulating its actual operating conditions.

3. Monitoring and Verification: The device's contact actions, messages, and output times are monitored in real time. By comparing the actual action behavior and operating time with theoretical expectations, the reliability and speed of its protection function can be accurately evaluated, completing the debugging, verification, and acceptance of the protection device. Three-phase relay tester, three-phase relay protection tester

Three-phase relay protection tester (4-phase voltage, 3-phase current)

1. Flexible voltage and current output combinations: Features standard 4-phase voltage and 3-phase current outputs, allowing for convenient combination outputs for various types of protection tests.
Each phase can output 120V, and the current (three-phase) can output 120A. The 4th phase voltage (Ux) is a multi-functional voltage item, allowing for four different output types (3U0, synchronization voltage detection, or any voltage value).

2. Convenient stand-alone operation: The device panel includes a trackball mouse, optimized keyboard, and a large-screen TFT LCD display, with built-in Windows platform operating software. It's ready to use immediately upon power-on, offering convenient and quick operation.

3. Dual operation modes: In addition to stand-alone operation, the device can also be operated via a laptop or desktop computer. Both modes offer identical functionality, providing a truly complete dual operation mode.

4. New high-fidelity linear power amplifier: The output end consistently uses a high-fidelity, high-reliability modular linear power amplifier, rather than a switching amplifier, resulting in superior performance. It will not cause high or medium frequency interference at the test site, and ensures smooth waveforms and excellent accuracy throughout the entire current range, from large to small currents.

5. High-performance host: The output section adopts DSP control, with fast processing speed, strong real-time digital signal processing capability, wide transmission bandwidth, and high-resolution DAC control. The output waveform has high accuracy, low distortion, and good linearity. It adopts a large number of advanced technologies and precision components and materials, and has undergone professional structural design, resulting in a small size, light weight, full functionality, and easy portability. It can work immediately upon power-on and is very convenient for mobile testing.

6. Powerful software functions: It can complete various highly automated, large-scale, and complex verification tasks. It can easily test and scan various protection settings, perform fault return discharge, store test data in real time, display vector diagrams, and print reports online.

7. Independent dedicated DC power output: The device has one dedicated 110V and 220V adjustable DC power output.

8. Abundant contacts: It has 8 input contacts and 4 unused output contacts. 9. Input contacts are compatible with both dry contacts and 0-250V potential contacts, and can be intelligently and automatically identified.

10. Complete interfaces: The device panel has a built-in keyboard and mouse, allowing for standalone operation or operation with an external keyboard and mouse.

It also features two USB ports and an RS232 port for communication with computers and other external devices.

11. Comprehensive self-protection functions: The heat dissipation structure is rationally designed, and the hardware protection measures are reliable and comprehensive. It has a power soft-start function, and the software performs fault self-diagnosis and output interlocking functions.

12. Lightweight, compact, and highly integrated standalone and integrated structure: Utilizing numerous high-tech, meticulously designed ultra-lightweight structures, the entire device is extremely compact and lightweight.

1. AC Current Output: 3 channels, 40A/450VA each, three-phase parallel connection 120A/1000VA

2. AC Voltage Output: 4 channels, 120V/80VA each, line voltage 240V/120VA

3. Output Accuracy: 0.2% (within main range)

4. DC Current Output: 3 channels, ±10A/200VA each

5. DC Voltage Output: 3 channels, ±160V/80VA each

6. Output Accuracy: 0.5% (within main range)

7. Phase: 0-360°

8. Phase Accuracy: <0.2°

9. Output Frequency: 0-1200Hz

10. Frequency Accuracy: <0.1Hz

11. Superimposed Harmonics: 2nd-24th order

12. Inputs: 8 channels, Outputs: 4 pairs

13. Independent DC: DC110/220V Rated current 1.5A
14. Dimensions: 396mm*354mm*178mm
Weight: 16kg

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